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  1. Re: 820-3787 PPDCIN_G3H fluctuating around 2V

    if q7135 was shorted I am supposed to replace q7130 along with it, right ?
  2. Re: 820-3787 PPDCIN_G3H fluctuating around 2V

    hey gurmon, thanks for your answer. all components around q7180 and the mosfet itself look fine. all the surroundings measure fine. Do you think I should replace it even though I have ppdcin_g3h...
  3. Re: 820-3787 PPDCIN_G3H fluctuating around 2V

    I removed again f7140 and f7141. On the ppbus side I have about 0.4 diode drop (final reading after 5 - 10 seconds) but if I switch the probes my values start negative and then going up. switching...
  4. 820-3787 PPDCIN_G3H fluctuating around 2V

    Hi guys,

    I have this liquid damaged board here that makes me scratch my head. I seem to miss something here.

    I replaced u7100, U4850, U7090, Q7135, R7150, F7140, F7141. Also reworked the...
  5. Re: Best solution for dying 820-2915 / 820-2914 boards

    I do that a lot. r8911 is mandatory. I tell the people to dont pram reset. But tested also the "what if" situation: I boot blindly to single user recovery and enter the nvram fa4......

    The...
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    820 00165 no audio

    Hello again,

    liquid damaged board. Somebody worked before on it. SMC seems reflowed, reballed or replaced. Before I temper with this I want to exclude all other possibilities. Knownd good I / O...
  7. aA1989 - 820 - 00850 - flickering screen

    Dear forum, do I assume right that the backlight circuit on the logicboard and in no way the lcd or its small board needs to be responsible if I have steady backlight on the last 3 highest settings...
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    Re: 820 - 3332 ram issue

    Hey Mitch, sorry wasn't around here at all. Pretty busy. It' s the 16Gb version so I want to save it.

    I have some progress :-) I couldn't determine the bad chip by voltage injection but I was...
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    Re: 820-3208 - axg vcore missing

    I have a steady SYSCLK_CLK32K_RTC wave and steady 12mhz on smc_xtal.

    It is not my first contact with an oscilloscope but alike :-)

    The SPI signals aren't good if I interpret right. Don't keep...
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    Re: 820 - 3332 ram issue

    hey Mitch, hey guys,

    today I injected 0.7 V and was consuming about 0.6A but nothing, really nothing warm to find. Neither any RAM chip nor the CPU.

    Is my only way to proceed to remove one chip...
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    Re: 820 - 3332 ram issue

    yes, injection was my plan indeed. Chances are that the cpu gets hot.....lets see

    What would be the expected behavior on a running board if one removes one ram bank ? Will it just go ...
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    Re: 820 - 3332 ram issue

    I found a short to gnd on MEM_A_A<13>

    I can not find any information if it is possible to disable or remove a bank, or better said the only information I find is that it is not possible. I saw...
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    Re: 820 - 3332 ram issue

    I will try a battery start later but if I remember right it was the same.

    As I wrote in my first post the ultrasonic changed the situation. On a cold boot fan is spinning for 10 to 12 seconds and...
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    Re: 820-3208 - axg vcore missing

    damn it. I thought I found the problem but no, or maybe ......

    something is wrong at least with the schematics. r5361 and r5433 pads aren't stuffed and there where c5361 and c5433 are supposed to...
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    Re: 820 - 3332 ram issue

    How can I run ASD with no chime and ram beeps ?

    No liquid around the ram chips.

    Nothing got hot in my hands. I saw some squeezed out solder and the person who gave the computer to me told me...
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    820 - 3332 ram issue

    hey guys,

    i have a retina "15 2012 here with a little bit of liquid spill. Signs are there that the board shorted and got really hot ( some squeezed out balls on 2 or 3 very small chips)

    It...
  17. Re: 2011 MacBook Pro 15''/17'' GPU disable with no HW mods

    the 3v3:s0 jumper for backlight in high sierra or is that another one ?

    Honestly I find the nvram modification together with r8911 removal quite good. no kext or ither mods necessary.

    I...
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    Re: 820-3208 - axg vcore missing

    I will get me an osziloscope and an spi programmer. I guess its time :-)

    But honestly, for this machine, my feeling tells me that the efi is fine and that some line is broken here or that there is...
  19. make a 2012 screen fit in 2013 macbook air "13

    Does anyone know if I can install a 2013/14/15/17 left hinge cable tree and antenna rail (isight, wifi, bluetooth...) in an 2012 display ?
    I have a 2012 screen and dont want to buy another one if I...
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    Re: 820-3208 - axg vcore missing

    no I don't. I will get one soon I guess. Would it not chime with the 3209 ?
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    Re: 820-3208 - axg vcore missing

    Hey guys, thanks for getting back to me. I only have a 820 3209 donor spi. Can I use it, at least for testing ?

    I didn't mention:

    - I replaced R6905( totally blown) and R6920(slightly wrong...
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    820-3208 - axg vcore missing

    I have a 11inch MacBook air here with liquid spill. after fixing PP3V42_G3H the fan spins continuously, not as I am used on AIr`s 3 times. Not booting, chiming, posting. no effect on pram reset...
  23. Re: 820 - 2915 mystery to me - [ fan spin, video(backlight) but not posting/chiming ]

    yes the mouse lights up.
    I would say cpu, gpu and pch have normal temperatures
  24. Re: 820 - 2915 mystery to me - [ fan spin, video(backlight) but not posting/chiming ]

    No suggestions ?
  25. Re: 820 - 2915 mystery to me - [ fan spin, video(backlight) but not posting/chiming ]

    I think the spi and rtc are the wrong road. I compared my voltage measurements with a working macbook air ( i dont have a working 2915 here) and they are indeed the same. I remember that I had a...
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